package msq

import "errors"
import "fmt"
import "log"

type Sender interface {
	Send(interface{}) error
	Close() error
}

//具体的发送策略让客户端来做
type ChanServer struct {
	private map[int64]Sender
	public  map[int64]Sender
}

func NewChanServer() *ChanServer {
	server := &ChanServer{}
	server.private = make(map[int64]Sender)
	server.public = make(map[int64]Sender)
	return server
}

func (server *ChanServer) Bind(ty int, id int64, sender Sender) {
	if ty == Private {
		server.private[id] = sender
	}
	if ty == Public {
		server.public[id] = sender
	}
}

func (server *ChanServer) UnBind(ty int, id int64) {
	if ty == Private {
		delete(server.private, id)
	}
	if ty == Public {
		delete(server.public, id)
	}
}

func (server *ChanServer) Send(ty int, id int64, data interface{}) error {
	if ty == Private {
		return server.sendOne(server.private, ty, id, data)
	} else {
		return server.sendOne(server.public, ty, id, data)
	}
	return nil
}

func (server *ChanServer) sendOne(senders map[int64]Sender, ty int, id int64, data interface{}) error {
	if id == 0 {
		for newid, v := range senders {
			err := v.Send(data)
			if err != nil {
				server.UnBind(ty, newid)
				v.Close()
			}
		}
	} else {
		if sender, ok := senders[id]; ok {
			err := sender.Send(data)
			if err != nil {
				server.UnBind(ty, id)
				sender.Close()
			}
		} else {
			err := errors.New("sendOne error, id not exist" + fmt.Sprint(id))
			log.Println(err)
			return err
		}
	}
	return nil
}

//默认向所有的public的客户端发送
func (server *ChanServer) SendPublic(msg *Message) error {
	return server.Send(Public, 0, msg)
}

func (server *ChanServer) SendPrivate(msg *Message) error {
	return server.Send(Private, msg.ClientId, msg)
}